Explicitly prevent `sudo` access for user module

To deny a user elevated access, you can omit the `sudo` key from the
`users` dictionary. This works fine however it's implicitly defined
based on defaults of `cloud-init`. If the project moves to have `sudo`
access allowed for all by default (quite unlikely but still possible)
this will catch a few people out.

This introduces the ability to define an explicit `sudo: False` in the
`users` dictionary and it will prevent `sudo` access. The behaviour is
identical to omitting the key.

LP: #1771468

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